2019-05-29 22:12:41 +08:00
|
|
|
// SPDX-License-Identifier: GPL-2.0-only
|
2011-11-01 07:54:08 +08:00
|
|
|
/*
|
|
|
|
* Memory subsystem initialization for Hexagon
|
|
|
|
*
|
2013-03-29 09:45:40 +08:00
|
|
|
* Copyright (c) 2010-2013, The Linux Foundation. All rights reserved.
|
2011-11-01 07:54:08 +08:00
|
|
|
*/
|
|
|
|
|
|
|
|
#include <linux/init.h>
|
|
|
|
#include <linux/mm.h>
|
2018-10-27 06:04:44 +08:00
|
|
|
#include <linux/memblock.h>
|
2011-11-01 07:54:08 +08:00
|
|
|
#include <asm/atomic.h>
|
|
|
|
#include <linux/highmem.h>
|
|
|
|
#include <asm/tlb.h>
|
|
|
|
#include <asm/sections.h>
|
|
|
|
#include <asm/vm_mmu.h>
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Define a startpg just past the end of the kernel image and a lastpg
|
|
|
|
* that corresponds to the end of real or simulated platform memory.
|
|
|
|
*/
|
2013-03-23 05:05:40 +08:00
|
|
|
#define bootmem_startpg (PFN_UP(((unsigned long) _end) - PAGE_OFFSET + PHYS_OFFSET))
|
2011-11-01 07:54:08 +08:00
|
|
|
|
2013-03-23 05:05:40 +08:00
|
|
|
unsigned long bootmem_lastpg; /* Should be set by platform code */
|
|
|
|
unsigned long __phys_offset; /* physical kernel offset >> 12 */
|
2011-11-01 07:54:08 +08:00
|
|
|
|
|
|
|
/* Set as variable to limit PMD copies */
|
|
|
|
int max_kernel_seg = 0x303;
|
|
|
|
|
|
|
|
/* indicate pfn's of high memory */
|
|
|
|
unsigned long highstart_pfn, highend_pfn;
|
|
|
|
|
|
|
|
/* Default cache attribute for newly created page tables */
|
|
|
|
unsigned long _dflt_cache_att = CACHEDEF;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* The current "generation" of kernel map, which should not roll
|
|
|
|
* over until Hell freezes over. Actual bound in years needs to be
|
|
|
|
* calculated to confirm.
|
|
|
|
*/
|
|
|
|
DEFINE_SPINLOCK(kmap_gen_lock);
|
|
|
|
|
|
|
|
/* checkpatch says don't init this to 0. */
|
|
|
|
unsigned long long kmap_generation;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* mem_init - initializes memory
|
|
|
|
*
|
|
|
|
* Frees up bootmem
|
|
|
|
* Fixes up more stuff for HIGHMEM
|
|
|
|
* Calculates and displays memory available/used
|
|
|
|
*/
|
|
|
|
void __init mem_init(void)
|
|
|
|
{
|
|
|
|
/* No idea where this is actually declared. Seems to evade LXR. */
|
2018-10-31 06:09:30 +08:00
|
|
|
memblock_free_all();
|
2011-11-01 07:54:08 +08:00
|
|
|
|
|
|
|
/*
|
|
|
|
* To-Do: someone somewhere should wipe out the bootmem map
|
|
|
|
* after we're done?
|
|
|
|
*/
|
|
|
|
|
|
|
|
/*
|
|
|
|
* This can be moved to some more virtual-memory-specific
|
|
|
|
* initialization hook at some point. Set the init_mm
|
|
|
|
* descriptors "context" value to point to the initial
|
|
|
|
* kernel segment table's physical address.
|
|
|
|
*/
|
|
|
|
init_mm.context.ptbase = __pa(init_mm.pgd);
|
|
|
|
}
|
|
|
|
|
|
|
|
void sync_icache_dcache(pte_t pte)
|
|
|
|
{
|
|
|
|
unsigned long addr;
|
|
|
|
struct page *page;
|
|
|
|
|
|
|
|
page = pte_page(pte);
|
|
|
|
addr = (unsigned long) page_address(page);
|
|
|
|
|
|
|
|
__vmcache_idsync(addr, PAGE_SIZE);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* In order to set up page allocator "nodes",
|
|
|
|
* somebody has to call free_area_init() for UMA.
|
|
|
|
*
|
|
|
|
* In this mode, we only have one pg_data_t
|
|
|
|
* structure: contig_mem_data.
|
|
|
|
*/
|
|
|
|
void __init paging_init(void)
|
|
|
|
{
|
2020-06-04 06:57:06 +08:00
|
|
|
unsigned long max_zone_pfn[MAX_NR_ZONES] = {0, };
|
2011-11-01 07:54:08 +08:00
|
|
|
|
|
|
|
/*
|
|
|
|
* This is not particularly well documented anywhere, but
|
|
|
|
* give ZONE_NORMAL all the memory, including the big holes
|
|
|
|
* left by the kernel+bootmem_map which are already left as reserved
|
|
|
|
* in the bootmem_map; free_area_init should see those bits and
|
|
|
|
* adjust accordingly.
|
|
|
|
*/
|
|
|
|
|
2020-06-04 06:57:06 +08:00
|
|
|
max_zone_pfn[ZONE_NORMAL] = max_low_pfn;
|
2011-11-01 07:54:08 +08:00
|
|
|
|
2020-06-04 06:57:06 +08:00
|
|
|
free_area_init(max_zone_pfn); /* sets up the zonelists and mem_map */
|
2011-11-01 07:54:08 +08:00
|
|
|
|
|
|
|
/*
|
|
|
|
* Start of high memory area. Will probably need something more
|
|
|
|
* fancy if we... get more fancy.
|
|
|
|
*/
|
|
|
|
high_memory = (void *)((bootmem_lastpg + 1) << PAGE_SHIFT);
|
|
|
|
}
|
|
|
|
|
|
|
|
#ifndef DMA_RESERVE
|
|
|
|
#define DMA_RESERVE (4)
|
|
|
|
#endif
|
|
|
|
|
|
|
|
#define DMA_CHUNKSIZE (1<<22)
|
|
|
|
#define DMA_RESERVED_BYTES (DMA_RESERVE * DMA_CHUNKSIZE)
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Pick out the memory size. We look for mem=size,
|
|
|
|
* where size is "size[KkMm]"
|
|
|
|
*/
|
|
|
|
static int __init early_mem(char *p)
|
|
|
|
{
|
|
|
|
unsigned long size;
|
|
|
|
char *endp;
|
|
|
|
|
|
|
|
size = memparse(p, &endp);
|
|
|
|
|
|
|
|
bootmem_lastpg = PFN_DOWN(size);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
early_param("mem", early_mem);
|
|
|
|
|
|
|
|
size_t hexagon_coherent_pool_size = (size_t) (DMA_RESERVE << 22);
|
|
|
|
|
|
|
|
void __init setup_arch_memory(void)
|
|
|
|
{
|
|
|
|
/* XXX Todo: this probably should be cleaned up */
|
|
|
|
u32 *segtable = (u32 *) &swapper_pg_dir[0];
|
|
|
|
u32 *segtable_end;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Set up boot memory allocator
|
|
|
|
*
|
|
|
|
* The Gorman book also talks about these functions.
|
|
|
|
* This needs to change for highmem setups.
|
|
|
|
*/
|
|
|
|
|
2013-03-23 05:05:40 +08:00
|
|
|
/* Prior to this, bootmem_lastpg is actually mem size */
|
|
|
|
bootmem_lastpg += ARCH_PFN_OFFSET;
|
|
|
|
|
2011-11-01 07:54:08 +08:00
|
|
|
/* Memory size needs to be a multiple of 16M */
|
|
|
|
bootmem_lastpg = PFN_DOWN((bootmem_lastpg << PAGE_SHIFT) &
|
|
|
|
~((BIG_KERNEL_PAGE_SIZE) - 1));
|
|
|
|
|
2018-10-27 06:04:44 +08:00
|
|
|
memblock_add(PHYS_OFFSET,
|
|
|
|
(bootmem_lastpg - ARCH_PFN_OFFSET) << PAGE_SHIFT);
|
|
|
|
|
|
|
|
/* Reserve kernel text/data/bss */
|
|
|
|
memblock_reserve(PHYS_OFFSET,
|
|
|
|
(bootmem_startpg - ARCH_PFN_OFFSET) << PAGE_SHIFT);
|
2011-11-01 07:54:08 +08:00
|
|
|
/*
|
|
|
|
* Reserve the top DMA_RESERVE bytes of RAM for DMA (uncached)
|
|
|
|
* memory allocation
|
|
|
|
*/
|
2013-03-23 05:05:40 +08:00
|
|
|
max_low_pfn = bootmem_lastpg - PFN_DOWN(DMA_RESERVED_BYTES);
|
|
|
|
min_low_pfn = ARCH_PFN_OFFSET;
|
2018-10-27 06:04:44 +08:00
|
|
|
memblock_reserve(PFN_PHYS(max_low_pfn), DMA_RESERVED_BYTES);
|
2011-11-01 07:54:08 +08:00
|
|
|
|
|
|
|
printk(KERN_INFO "bootmem_startpg: 0x%08lx\n", bootmem_startpg);
|
|
|
|
printk(KERN_INFO "bootmem_lastpg: 0x%08lx\n", bootmem_lastpg);
|
2013-03-23 05:05:40 +08:00
|
|
|
printk(KERN_INFO "min_low_pfn: 0x%08lx\n", min_low_pfn);
|
2011-11-01 07:54:08 +08:00
|
|
|
printk(KERN_INFO "max_low_pfn: 0x%08lx\n", max_low_pfn);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* The default VM page tables (will be) populated with
|
|
|
|
* VA=PA+PAGE_OFFSET mapping. We go in and invalidate entries
|
|
|
|
* higher than what we have memory for.
|
|
|
|
*/
|
|
|
|
|
|
|
|
/* this is pointer arithmetic; each entry covers 4MB */
|
|
|
|
segtable = segtable + (PAGE_OFFSET >> 22);
|
|
|
|
|
|
|
|
/* this actually only goes to the end of the first gig */
|
|
|
|
segtable_end = segtable + (1<<(30-22));
|
|
|
|
|
2013-03-23 05:05:40 +08:00
|
|
|
/*
|
|
|
|
* Move forward to the start of empty pages; take into account
|
|
|
|
* phys_offset shift.
|
|
|
|
*/
|
2011-11-01 07:54:08 +08:00
|
|
|
|
2013-03-23 05:05:40 +08:00
|
|
|
segtable += (bootmem_lastpg-ARCH_PFN_OFFSET)>>(22-PAGE_SHIFT);
|
2011-11-01 07:54:08 +08:00
|
|
|
{
|
2013-03-23 05:05:40 +08:00
|
|
|
int i;
|
2011-11-01 07:54:08 +08:00
|
|
|
|
2013-03-23 05:05:40 +08:00
|
|
|
for (i = 1 ; i <= DMA_RESERVE ; i++)
|
|
|
|
segtable[-i] = ((segtable[-i] & __HVM_PTE_PGMASK_4MB)
|
2011-11-01 07:54:08 +08:00
|
|
|
| __HVM_PTE_R | __HVM_PTE_W | __HVM_PTE_X
|
|
|
|
| __HEXAGON_C_UNC << 6
|
|
|
|
| __HVM_PDE_S_4MB);
|
|
|
|
}
|
|
|
|
|
|
|
|
printk(KERN_INFO "clearing segtable from %p to %p\n", segtable,
|
|
|
|
segtable_end);
|
|
|
|
while (segtable < (segtable_end-8))
|
|
|
|
*(segtable++) = __HVM_PDE_S_INVALID;
|
|
|
|
/* stop the pointer at the device I/O 4MB page */
|
|
|
|
|
|
|
|
printk(KERN_INFO "segtable = %p (should be equal to _K_io_map)\n",
|
|
|
|
segtable);
|
|
|
|
|
|
|
|
#if 0
|
|
|
|
/* Other half of the early device table from vm_init_segtable. */
|
|
|
|
printk(KERN_INFO "&_K_init_devicetable = 0x%08x\n",
|
|
|
|
(unsigned long) _K_init_devicetable-PAGE_OFFSET);
|
|
|
|
*segtable = ((u32) (unsigned long) _K_init_devicetable-PAGE_OFFSET) |
|
|
|
|
__HVM_PDE_S_4KB;
|
|
|
|
printk(KERN_INFO "*segtable = 0x%08x\n", *segtable);
|
|
|
|
#endif
|
|
|
|
|
|
|
|
/*
|
|
|
|
* The bootmem allocator seemingly just lives to feed memory
|
|
|
|
* to the paging system
|
|
|
|
*/
|
|
|
|
printk(KERN_INFO "PAGE_SIZE=%lu\n", PAGE_SIZE);
|
|
|
|
paging_init(); /* See Gorman Book, 2.3 */
|
|
|
|
|
|
|
|
/*
|
|
|
|
* At this point, the page allocator is kind of initialized, but
|
|
|
|
* apparently no pages are available (just like with the bootmem
|
|
|
|
* allocator), and need to be freed themselves via mem_init(),
|
|
|
|
* which is called by start_kernel() later on in the process
|
|
|
|
*/
|
|
|
|
}
|
2022-07-11 15:05:46 +08:00
|
|
|
|
|
|
|
static const pgprot_t protection_map[16] = {
|
|
|
|
[VM_NONE] = __pgprot(_PAGE_PRESENT | _PAGE_USER |
|
|
|
|
CACHEDEF),
|
|
|
|
[VM_READ] = __pgprot(_PAGE_PRESENT | _PAGE_USER |
|
|
|
|
_PAGE_READ | CACHEDEF),
|
|
|
|
[VM_WRITE] = __pgprot(_PAGE_PRESENT | _PAGE_USER |
|
|
|
|
CACHEDEF),
|
|
|
|
[VM_WRITE | VM_READ] = __pgprot(_PAGE_PRESENT | _PAGE_USER |
|
|
|
|
_PAGE_READ | CACHEDEF),
|
|
|
|
[VM_EXEC] = __pgprot(_PAGE_PRESENT | _PAGE_USER |
|
|
|
|
_PAGE_EXECUTE | CACHEDEF),
|
|
|
|
[VM_EXEC | VM_READ] = __pgprot(_PAGE_PRESENT | _PAGE_USER |
|
|
|
|
_PAGE_EXECUTE | _PAGE_READ |
|
|
|
|
CACHEDEF),
|
|
|
|
[VM_EXEC | VM_WRITE] = __pgprot(_PAGE_PRESENT | _PAGE_USER |
|
|
|
|
_PAGE_EXECUTE | CACHEDEF),
|
|
|
|
[VM_EXEC | VM_WRITE | VM_READ] = __pgprot(_PAGE_PRESENT | _PAGE_USER |
|
|
|
|
_PAGE_EXECUTE | _PAGE_READ |
|
|
|
|
CACHEDEF),
|
|
|
|
[VM_SHARED] = __pgprot(_PAGE_PRESENT | _PAGE_USER |
|
|
|
|
CACHEDEF),
|
|
|
|
[VM_SHARED | VM_READ] = __pgprot(_PAGE_PRESENT | _PAGE_USER |
|
|
|
|
_PAGE_READ | CACHEDEF),
|
|
|
|
[VM_SHARED | VM_WRITE] = __pgprot(_PAGE_PRESENT | _PAGE_USER |
|
|
|
|
_PAGE_WRITE | CACHEDEF),
|
|
|
|
[VM_SHARED | VM_WRITE | VM_READ] = __pgprot(_PAGE_PRESENT | _PAGE_USER |
|
|
|
|
_PAGE_READ | _PAGE_WRITE |
|
|
|
|
CACHEDEF),
|
|
|
|
[VM_SHARED | VM_EXEC] = __pgprot(_PAGE_PRESENT | _PAGE_USER |
|
|
|
|
_PAGE_EXECUTE | CACHEDEF),
|
|
|
|
[VM_SHARED | VM_EXEC | VM_READ] = __pgprot(_PAGE_PRESENT | _PAGE_USER |
|
|
|
|
_PAGE_EXECUTE | _PAGE_READ |
|
|
|
|
CACHEDEF),
|
|
|
|
[VM_SHARED | VM_EXEC | VM_WRITE] = __pgprot(_PAGE_PRESENT | _PAGE_USER |
|
|
|
|
_PAGE_EXECUTE | _PAGE_WRITE |
|
|
|
|
CACHEDEF),
|
|
|
|
[VM_SHARED | VM_EXEC | VM_WRITE | VM_READ] = __pgprot(_PAGE_PRESENT | _PAGE_USER |
|
|
|
|
_PAGE_READ | _PAGE_EXECUTE |
|
|
|
|
_PAGE_WRITE | CACHEDEF)
|
|
|
|
};
|
|
|
|
DECLARE_VM_GET_PAGE_PROT
|